Petrified Forest Natn'l., AZ/Mon. Petrified wood pieces close-up showing crystalization 2/86v xc
Petrified Forest National, AZ/Park, Blue Mesa, Pedestal Logs at sunrise. 991h
Petrified Forest National, AZ/Park, Jasper Forest, Whipple's Cholla (Opuntia whipplei) against cross-section of petrified log. 991v
